Heap-Based Buffer Overflow in OpenPrinting CUPS Scheduler

Publication date: 2026-04-03

Last updated on: 2026-04-16

Assigner: GitHub, Inc.

Description

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attribute. At time of publication, there are no publicly available patches.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-03

Last Modified

2026-04-16

Generated

2026-07-06

AI Q&A

2026-04-04

EPSS Evaluated

2026-07-05

NVD

CVE-2026-34979

Affected Vendors & Products

Vendor	Product	Version / Range
openprinting	cups	to 2.4.16 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Impact Analysis

The vulnerability can lead to a denial of service (DoS) condition due to the heap-based buffer overflow. According to the CVSS score, it does not impact confidentiality or integrity but can affect availability.

Executive Summary

This vulnerability is a heap-based buffer overflow found in the CUPS scheduler component of OpenPrinting CUPS versions 2.4.16 and earlier. It occurs when the scheduler builds filter option strings from job attributes, potentially causing memory corruption.

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